[issue2920] Patch to print symbolic value of errno in OSError.__str__()

[Zackery Spytz]

Zackery Spytz <zspytz at gmail.com> added the comment:

Eryk, I'm not sure if something similar should be done for winerror. I think it's best to keep OSError_str() as simple as possible.

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<https://bugs.python.org/issue2920>
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